(80-z)/(80-60)=0.125

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Solution for (80-z)/(80-60)=0.125 equation: 


z in (-oo:+oo)

(80-z)/(80-60) = 0.125 // - 0.125

(80-z)/(80-60)-0.125 = 0

(80-z)/20-0.125 = 0

(80-z)/20+(-0.125*20)/20 = 0

80-z-0.125*20 = 0

77.5-z = 0

(77.5-z)/20 = 0

(77.5-z)/20 = 0 // * 20

77.5-z = 0

77.5-z = 0 // - 77.5

-z = -77.5 // * -1

z = 77.5

z = 77.5

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